Mold for artificial repair-teeth.



L. w. FROMM.

MOLD FOR ARTIFICIAL REPAIR TEETH. APPUCATIGN FILED JULY13. 1916.-

1,282,210. Patented 00 5.22, 1918.

WITNESSES z' nvvmron e I .Zifl/Fi'amm g'ywga {g 19/ ATTORNEYS invented "a 5 mical advantage for mom) son ARTIFICIAL R PAIR-TEE H.

Specification of Letters Patent. I

Patented ea. 22,191.;8.

Application filed-M13 13, 1916. Serial No. 109,065.

To all whom it may concern:

Be it known that I, LUTHER WV. FRoMM, 'a citizen of'the'Unite'd' States, and resident of Nome, in the Territory of Alaska, have new and. Improved Mold for Artificial Repair-Teeth," of, which the following isa full, clear, andexact description.

My invention relates to molds for forming artificialteth, and has for its object" the provision of means-in such a mold for forminginlthe back of the tooth-"member a cavity or recess of 'desired' shape and, within limitations fixed by the dimensionsof the tooth member, of any predetermined disposition relative to the said member;

3 The tooth memberjfor the'manufa'cture of whieh it is the obj ectof my present inventionto provide means, is fully specified in another 'application for United States Letters Patent made by me.

For present'purposes it may bebriefiy described as one in "which acavity or recess, preferably provided with undercut side walls is-'relatively so disposed in the tooth member as to adapt it to take the stumps of pins which are embodied-intooth-fronts of general use in the artg and "which are left protruding from the metallic backing of a bridge, crown," or plate whenever a tooth- 85 Consequently in order to provide, in a standardized line of manufacture of repair teeth, a cavity or recess for each tooth-front of mlnimized dimensions, calculated for use in repair work to receive a pair of pin stumps, it is desirable, in order to avoid the necessity of a separate mold for each tooth, to provide in one mold an adjustable member for forming said cavity or recess, whereby the same mold may be used to great econothe manufacture of a range of tooth-fronts of practically unlimited extent.

What constitutes my present invention will be hereinafter specified in detail and 0 succinctly set forth in the appended claims.

In the accompanying drawing wherein I illustrate my invention in one simple form of embodiment, Figure 1 shows, each in plan view, the exposed faces of a pair of juxta- 5 posed mold members, partially broken away.

cthat is made to impart the "a tooth-front. Theyshape of it shown in the front thereof is broken away from it. Such" Fig. 2 showsyas in vertical section along theline 2-2 of Fig. 1, the two nioldmembers, as shown 1 in "the :formenfigure, 0011- joined, with their faces juxtaposed, asin use.

Fig.3 is a vertical section as on the line 3-3ofFig.2;'

I Referring to the characters on the drawing,'aindicates one of a pair of mold members and Z) theothen They are provided with clamping bows y', that are hingedto one member, for example, asshown the memher a. When juxtaposed as shown in Figs.

2 and 3 thetwo members-areadapted'to be forcibly driven toward each other as by the aid of screws ic,one being provided in each free end-of the respective bows j. The bows and their parts appurtenant are only representative of compressing mechanism,

adapted for the purpose of driving the members a and?) together, and may be'varied at will.

Either one of the mold-members, for example a,is provided with shape desired to drawing is presented from selection at random, and is Varied according touthe toothfront, it is desired tomake.

The complementary mold member, Z) for example, to correspond with the one above named, is provided with a recess into which fits a countersunk block it. The block is of smaller dimension in one way than the recess which receives it, whereby adjustment of the block within its recess may be made. Such adjustment may be made and fixed by aid of any suitable mechanism, preferably consisting of studs 0 projecting from its onposite ends, respectively, through apertures provided for their reception in the end walls of the recess formed of the member Z2. Thumb nuts threaded to the projecting ends of said studs afiord the means of adjustment and when both are jammed against the outside walls of the member I) serve to secure the block it solidly within the recess.

In the face of the block it, I provide a mold core 2', that is preferably provided with a reduced shank seated into block, so that the core is removable and thereby made interchan eable with cores of different shapes, at Wlll. The core is preferably made of graphite or other heat-resisting material which after rendered easily a shaping recess a socket in the being, in the usual manner, baked in the material of which the tooth-front is made, such for example asa procelain composition, may be readily crumbled and removed. The use of graphite or the like is important if the walls 01": the core are inwardly inclined as illustrated, since such a core will shape an undercut cavity in a tooth-front. Otherwise it will be convenient to make the core of metal.

Dowel pins 1, in one mold member registering with sockets m in the other may be used for insuring accurate alinement or the mold members in their travel toward each other.

. In practice amember having a desired size and contour of shaping recess e is selected and likewise a core 11 as desired. The recess, after the mold members are made ready and the position of the core 91 fixed in required adjustment, is then supplied with asuliicient quantity of the tooth-front forming-composition in moldable form, as, for example, a powder or a paste. The mold-members are thereupon driven together or toward each other to the point desired, and in that operation the tooth-front forming composition is shaped to take form within the recess 6 and about the core 2'.

The mold with its charge is then baked in any usual or preferred manner. In baking the mold-members may be kept united or they may be separated, as preferred, and if separated only the member having the recess 6 is subjected to heat. The shank and socket union between the core c'and the block it readily lends itseli to the separation of the core and its mold member Whenever desired.

it should be observed that only the elements necessary to the completion of a single tooth-front are shown in the drawing. As

indicated by the broken lines Fig. l and in Fig. 3 each mold-member may comprise as many blocks 2' and recesses 0, adapted for the molding of as many tooth-fronts at one time, as may be found convenient and desirable.

What 1 claim is:

1. In a. two part mold for artificial teeth, the combination with one part provided with a tooth shaping recess, of the other part provided with a mold transversely adjustable to difierent positions relative to the said recess 'm the opposing member.

2. A member of a mold for artificial teeth, provided with a transversely adjustable block loosely carried within a. recess in said member and adjustable means for fixing the position. of the block in a vertical direction.

3. In a two part mold for artificial teeth, the combination with one part provided with a tooth shaping recess, of the other'part provided with a recess, a block mounted in said last mentioned recess and adjustable to difierent positions therein, a mold core mounted in said blockand adjustable therewith to difierent positions relative to the tooth shaping recess in the opposing mem ber.

LUTHER W. FROMIM Witnesses: V

T. M. Gnoaon Jams.

flopiee or this patent may be obtained for five cents each, by addressing the Commissioner or Eaten, Washington, I). G. 

